Angle piece for dental boring, milling, and grinding tools



April 26, 1932. T N CH E L ANGLE PIECE FOR DENTAL BORING, MILLING, AND GRINDING TOOLS Filed July 8, 1929 Muenfom: /7/I Q/1 enAq,ch R. Vdig't dwm Patented Apr. 26, 1932 UNITED STATES ALOIS KALTENBACH AND RICHARD VOIGT, OF POTSDAM, GERMANY ANGLE PIECE FOR DENTAL BOB-ENG, IVIILLING, AND GRINDING TOOLS Application filed July 8, 1929, Serial No. 376,777, and in Germany February 6, 1929.

This invention relates to contra-angle pieces having a bent handle for dental boring, milling and grinding tools, and the object of the invention is to provide particularly simple means for removing the head portion from the bent portion of the handle, so that the head portion can be released for sterilization by the dentist himself without any trouble. A further object of this new form of angle piece is to make the angle piece heads readily exchangeable, so that various angle piece heads, and even miniature heads, can be secured to one and the same instrument.

This object is attained according to the invention owing to the fact that the angle piece head is provided with a sleeve enclosing the entire bearing of the middle drive, said sleeve being completely closed with the exception of the end openings and being secured to the bent portion or knee of the handle member so as to be withdrawable with the head from the drive bearing. The head and the sleeve are preferably made in one piece, they may however consist of two separate members connected with one another by screwing or soldering.

Preferably the grip sleeve mounted on the handle is prolonged forwardly to such an extent that its front edge lies closely adjacent an to the edge of the sleeve of the head on the inner side of the bend of the handle. By this means, the manipulation of the angle piece is facilitated.

The securing of the sleeve of the head to the knee of the handle member is preferably effected by means of a spring loaded bolt secured to the handle member and engaging in a corresponding hole at the end of the sleeve. The releasing of the sleeve from the handle member may be effected by the aid of a pressure knob, which brings the spring loaded bolt into the unlocking position.

The sleeve may alternatively be connected with the knee of the handle member in some other way, for instance by a bayonet joint, by

screwing or the like. 7

The securing of the head with the sleeve to the knee of the handle member is preferably effected in such a Way that the sleeve can occupy difierent positions in relation to the knee of the handle member, so that the tool mounted in the angle piece head can be brought at any time into whatever position is most convenient. If the sleeve is secured to the knee of the handle member by the aid of a spring loaded bolt, the sleeve mounted on the head admits of being secured in difierent positions in relation to the handle member in the simplest manner by providing the end of the sleeve throughout its periphery with %o%es for the reception of the spring loaded The drive bearing for the middle drive, which is overlapped by the sleeve mounted on the head, is preferably screwed to the knee of the handle member. It may however alternatively be inserted loosely in the knee of the handle member, in which case however it is advisable to provide means to prevent the bearing rotating.

The head provided with the sleeve can in this construction of the angle pieces be most simply released from the knee of the handle member for sterilization, the drive bearing for the middle drive remaining mounted on the knee of the handle member. After mounting another head, which may be constructed as a miniature head, or even as a longitudinally divided head, the angle piece is again ready for use.

Since, as is known, the upper drive located in the head, in consequence of grinding dust or spittle penetrating into it, or water vapours, is exposed to excessive wear and rusting, it is further possible in the event of any disturbance occurring to replace the defective head member by a fresh one, and only the head member need be sent away fior repairs.

The cleaning and oiling of the upper and middle drive can likewise be efiected in the simplest manner by the dentist himself with the new angle piece, whereby the life of the instrument is considerably increased.

A contra-angle piece construct-ed according to the invention is illustrated by way of example in the accompanying drawings, in which:

Figure 1 shows the new angle piece in section,

Figure 2 the connection between the sleeve mounted on the knee of the head member and the handle member, and

Figure 8 a section through the sleeve on the line AB in Figure 2.

On the head member a is mounted a sleeve 12, overlapping the entire drive bearing 0 of the middle drive d, the end of the sleeve being secured to the knee 6 of the handle member a of the angle piece. The fastening is effected by a pin 7, which is pressed by a spring 9 into ahole h at the end of the sleeve 5. The spring 9 provided with the pin is secured to the rearendof -tl1e-'kn"ee-e of the handle and is partly overlapped by the forwardly extended grip 6 of the handle member e. In order that the head member a with the sleeve?) may be secured in different posi tions to the knee of the handle member 6, holes h for the reception of the spring loaded pin are provided on the end of the sleeve, as shown in section in Figure 8, over the entire periphery thereof. The releasing of the sleeve 5 from the knee of the handle member e is effected by depressing a knob i mounted on the spring 9.

The drive bearing 0 for the middle drive cl is connected by a screw j with the knee piece of the handle member 6. In an axial direction the fixing is efiected by a collar is on the drive bearing 0.

In Figure 1 an ordinary head member is shown. Instead of this head member a miniature head or a head of some other construction may be utilized.

What I claim is:

1. A contra-angle piece for dental boring, milling and grinding tools, comprising the combination with a handle member having a knee, amiddle drive and a bearing for said middle drive onsaid knee, of a sleeve having a head member thereon, a hole in its wall at the end thereof remote from the head memher and being completely closed with the exception of the end openings, and a lock-ing bolt on the knee, having a loading spring and engageable with the said hole in the sleeve, said sleeve being passed on to the knee and constructed so as to cover the said bearing for the middle'drive completely.

2. A contra-angle piece for dental boring, milling and grinding tools, comprising the combination with a handle member having a knee, a middle drive and a bearing for said middle drive on said knee, of a sleeve having ahead member thereon, a plurality of holes in its wall at the end thereof remote from the head member spaced round the periphery of the sleeve and being completely closed with the exception of the end openings and a locking bolt on the knee having a loading spring and engageable with said holes in thefsl'eeve, said sleeve being passed on to the knee and constructed so as to cover the said bearing for the middle drive completely.

3. A contra-angle piece for dental boring, milling and grinding tools, comprising a handle member having a knee, a middle drive and a bearing for the middle drive on said knee, a sleeve having a head member thereon and completely enclosed with the exception of the end opening, saidsleeve being removably secured to the knee and completely cov- "ering'the bearing, locking means for securing the -sleeve to thehandle in various positions,

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